Electric riveter



W. MORAVA.

ELECTRIC RIVETER.

1,195,928. APPLICATION FILED NOV. 27, I914- Aug. 22,

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W. MORAVA.

ELECTRIC RIVETER.

APPLICATION FILED NOV-27,1914.

1 1 9 5, 928 Patented Aug. 22, 1916.

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ELECTRIC RIVETER.

APPLICATION FILED NOV. 27. 1914.

Patented Aug. 22, 1916.

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.WENSEL MORAVA, CHICAGO, ILLINOIS.

ELECTRIC RIVETER.

Specification of Letters Patent.

Patented Aug. 22, 1916.

Application filed November 27, 1914. Serial No. 874,148.

To all whom it may concern:

Be it known that I, WnNsnL MoRAvA, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Electric Riveters, of which the following is a specification.

My invention relates to improvements in riveting machines.

It has for one object to provide a new and improved form of portable riveting machine which may be driven by an electric motor.

My invention is illustrated more or less diagrammatically in one form in the accompanying drawings, wherein Figure 1 is a side elevation in part section. Fig. 2 is a detail in part section on an enlarged scale of the upper portion of Fig. 1. Fig. 3 is an end elevation in part section of the controlling mechanism shown on the upper part of Fig. 1. Fig. 4 is a section along the line 33 of Fig. 3. Fig. 5 is a section along the line 5-5 of Fig. Fig. 6 is a wiring diagram.

Like parts are indicated by like letters in all of the figures.

A is the ordinary type of jaw frame having a fixed rivet head die A mounted on the lower arm member.

A is a bearing and guide sleeve integral with and mounted on the upper arm memher.

A is an extension or bracket projecting rearwardly from the upper arm member.

A are bosses whereby the riveter may be pivotally suspended by any suitable means not here shown.

A is a dolly bar slidably mounted in the bearing sleeve A and carrying on its lower end a removable rivet head die A.

A A, are links pivoted at one end on opposed sides of the lower end of the sleeve A and in pivotal engagement at the other end with a central link A which is pivoted at its lower end on the dolly bar A 13, B arebrackets mounted one on the upper jaw arm, the other on the part A 13 is a crosshead guide rigidly supported at either end by the brackets B, B

B is a crosshead slidable along the crosshead guide B and held in position thereon by a cap 13*.

B, B are links pivotally mounted each at one side on opposed sides of the crosshead B and each at the other end on the pin B upon which the links A A are also pivoted.

C is a bracket mounted upon the part A and having a thrust-bearing C to engage the thrust collars C on the rotary shaft {This rotary shaft C is rotatable in a bearlng C on the bracket B and terminates in a screw C which is threaded in the crosshead B 0 is a housing mounted on and projecting from the crosshead B to inclose the screw 0 when the crosshead is in its retracted position. v v c C is a thrust collar on the shaft C bearing against the end of the bearing C. v

D is a clutch disk or spider provided with the hub D free to rotateabout the shaft C butv held against longitudinal movement therealong by the collar D D is a conical clutch ring on the periphery of the spider D. D is a clutch spider provided with a hub D slidable along the shaft C but held against rotation thereabout by a key D which passes through a slot D therein and attached at either end to bosses D.

ID is a male clutch cone mounted on the spider D in opposition to the female clutch ring D E is an internal gear ring attached to and projecting from the rear of the ring D or the periphery of the Wheel D. In. mesh with it is a pinion E driven by the electric motor E and fly wheel E E is a hub slidably and rotatably mounted on the shaft C and limited in its backward movement by the hubD E is a clutch spider projecting from the hub E having a gear E about the periphery thereof in mesh with the pinion E and a female conical clutch member E in opposition to the male cone clutch member E E is a key slidable in the slot E in the shaft C attached at either end to lugs E on the hub E which is slidably mounted on the shaft C and carries the member E The rear end of the shaftC is centrally apertured as indicated at H, and in this central aperture is slidably mounted a control shaft H through which pass the keys E and D H is a screw threaded sleeve attached to the bearing C Through the center of this sleeve projects the end of the shaft H H is a nut rotatably mounted on the shaft H in screw threaded engagement with the sleeve H abutting at one end on the collar H rigid on the shaft and at the other end on the pinion H rigid on the shaft.

T is a latch lever rigidly mounted on the nut H and having at its lower end the latch jaw H.

H is a manually controlled handle suspended at its upper end on and free to swing about the shaft H The handle H is slotted as at H, and contains the carriage H slidably mounted therein and held in position by a plate T- H is a spring in the handle H adapted to yieldingly force the carriage T upwardly and to thrust the latch member H normally into engagement with the latch jaw I as indicated in Fig. 3.

l is a pin rotatably mounted in the upper end of the carriage H and projecting on either side outwardly beyond the handle H.

l is a pentagonal head on the pin 1.

l is a flat spring on the handle H adapted to engage one flat side of the pentagonal head.

It will be noted that the pin 1 is rotatable in the carriage H but carries keyed to its other end the five-pointed star or lever wheel 1". Each point or arm of the lever wheel terminates in two curved lugs I 1 of substantially the same contour as the spaces between the teeth in the pinion H 1, I, are slots respectively on the side of the handle 1 and the plate H to permit the sliding movement of the carriage H as it carries with it the pin 1 to be unresisted.

1 I, are springs projecting rear vardly from the bearing bracket C on either side of the handle H and extending into and beyond the plane of the star wheel. In the position shown in Fig. 3 with the handle to the right, the spring I yieldingly engages one of the arms and tends to rotate it in a clockwise direction. This yielding movement is resisted by the hook K which engages the neXt arm but one and prevents it being thrust into engagement with the gear by the spring action of the member 1 The hook K performs a similar function when the handle is in the left hand position, and

it prevents rotation of the star wheel in a.

counter clockwise direction. The hooks K, K it will be noted, are spring hooks, and offer no resistance to the movement of the star wheel toward them but normally pre vent a movement away. 'Mounted and projecting rearwardly from the handle H is a bracket K which carries the hooks K, K and magnets K K, having poles K", K which extend down toward the hooks K, K which hooks serve' as armatures for these poles, and when one or other of the magnets and poles are excited, the armatures or hooks are drawn toward the pole to release the arm.

Referring to the wiring diagram on Fig. 6, M is a conductor leading from any source of electric power not shown to the crosshead B M is a terminal brush on the righthand end of the crosshead. M is a terminal brush on the bracket B. M is a conductor leading from the brush M to the magnet K M is a conductor leading from the magnet K to the other terminal of the source of electric power. M is a brush on the lefthand end of the crosshead B M is a brush on the bracket B M is a conductor leading therefrom to the magnet K and M is a conductor leading from the magnet to the conductor l O, O are conductors leading from a suitable source of electric power to the motor 0 O are shunt conductors leading from the conductors, O, through a shunt coil 0 In this shunt coil is located an armature O withheld by a spring 0.

O is a switch blade actuated by the armature 0 attached when the armature O is drawn in owing to too great resistance in the motor, which in the usual way would build up a counter E. M. F. and shunt the current through the coil 0* to connect the three switch points 0 0, G 0 O 0 are conductors leading from these points or blades respectively to the conductors M, M and M P is an arm projecting upwardly from the part H and free to rotate with it.

P are substantially semi-circular spring members attached at one end each to the arm P on opposed sides thereof, and at the other end each to the lower side of the 15 sleeve H They tend, of course, normally to force the arm P into the position shown in dotted line in Fig. 3, so that the two springs form a substantially accurate circle.

The use and operation of my invention l are as follows The rivets are driven in the usual manner by the reciprocating dolly bar which carries one rivet head die and as it reciprocates compresses the rivet between such die and the fixed die on the lower arm. The reciprocation on the dolly bar by the toggle action of the linkage is in the ordinary manner in response to the retation of the main tension links about their pivotal. point. caused by a reciprocation of the crosshead which, as it approaches the front end of the machine, rotates the links and causes them to exert the toggle effect.

Referring particularly to Fig. 2, it will be noted that the crosshead is also a nut, and has in screw-threaded engagement therewith one end of a rotatable shaft. This shaft is normally when in the inoperative position as shown in Fig. 2, inclo-sed partially by the mechanism and partially by the sleeve projecting from the crosshead or nut. vVhen it is desired to drive a. rivet, the operator will move the control handle from the central position toward the left,

This rotation is of course thus rotating the nut and. forcing the control shaft inwardly. This control shaft carries with it the male portion of the larger cone clutch, and as this cone clutch engages with the rapidly moving female portlon, which of course being driven by the electric motor is rotating at all times, the shaft will commence to rotate and feed the crosshead forward to operate the linkage and drive the rivet. \Vhen the rivet has been driven, the operator will throw the handle back in the opposite directionrotatmg the nut in the opposite direction to withdraw the control rod and bring the small clutch into operation. This will previously of course free the large clutch and cause the shaft to rotate in the opposite direction because the smaller clutch is rotating in the opposite direction. This will withdraw the crosshead and move the dolly bar and rivet head die away from the work. Since less power is required, the gear ratio is of course smaller and the withdrmval of the crosshead is more. rapid than its working movement. Thus the machine can be completely controlled by the hand of the operator working on the control lever.

The operation of the automatic control and electric protective features of my device are as follows:If the crosshead reaches the true limit of its excursion without having been stopped by the act of the operator, the brush on the crosshead, which brush is preferably grounded though it need not be, will close the circuit through the terminal on the right hand bracket on the magnet, and the source of electric power, one terminal of which is grounded, to draw up the hook armature which holds the lever wheel, and allow a finger to be thrown by the spring into engagement with the pinion on the end of the shaft. As the shaft is rotating in a counter clockwise direction, this will tend to force the finger toward the handle, compress the spiral spring and release the latch lever and latch jaw carried thereby from the slid-able latch when the spring is overcome and the slidable latch disengaged. The semi-circular springs will then throw the control lever into the central position rotating the nut to draw the control shaft out to disconnect the clutch and allow the parts to remain at rest. The rivet driving screw in engagement with the nut makes a self-locking mechanism and the nut therefore stays where it is put so that when the screw is rotated to force the nut er crosshead along to drive the rivet, the pressure on the rivet can be indefinitely maintained merely by disconnecting the drivlng mechanlsm, and this pressure will not be released no matter how long the delay until the withdrawing connection is 0perated to withdraw the crosshead and positively release the rivet.

I claim:

1. In an electric riveting machine a slidably mounted screw-threaded crosshead, a drive screw in engagement therewith, a plurality of electrically driven drive members constantly rotating about the screw in opposite directions, and at different Velocities, clutch members mounted on and held against rotation with respect to the screw in opposition to said drive members and means for throwing one of said clutch members at a time into engagement with its adjacent drive member to rotate the drive screw.

2. In an electric riveting machine a slidably mounted screw-threaded crosshead, a drive screw in engagement therewith, a plurality of electrically driven drive members constantly rotating about the screw in opposite directions, clutch members mounted on and held against rotation with respect to the screw in opposition to said drive members and means for throwing one of said clutch members at a time into engagement with its adjacent drive member to rotate the drive screw.

3. In an electric riveting machine a slidably mounted screw-threaded crosshead, a drive screw in engagement therewith, a plurality of electrically driven drive members constantly rotating about the screw in opposite directions, and at difierent velocities, clutch members mounted on and held against rotation with respect to the screw in opposition to said drive members and means for throwing one of said clutch members at a time into engagement with its adjacent drive member to rotate the drive screw, said means comprising a control shaft within the screw and a connection from it to each clutch member and means independent of the rotation of the screw and drive members for moving said shaft and clutch members in unison toward and from the appropriate drive member.

In testimony whereof, I aliix my signature in the presence of two witnesses this 23rd day of of November, 1914.

W-ENSEL MORAVA. \Vitnesses:

MINNIE M. LINDENAU, CI-IRISTINIA DEANS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

